Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932516AbdCUNVd (ORCPT ); Tue, 21 Mar 2017 09:21:33 -0400 Received: from hqemgate14.nvidia.com ([216.228.121.143]:7600 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756327AbdCUNVc (ORCPT ); Tue, 21 Mar 2017 09:21:32 -0400 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 21 Mar 2017 06:21:30 -0700 From: Peter De Schrijver To: Peter De Schrijver , Michael Turquette , Stephen Boyd , , Subject: [PATCH] clk: add clk_possible_parents debugfs file Date: Tue, 21 Mar 2017 15:20:31 +0200 Message-ID: <1490102432-21314-1-git-send-email-pdeschrijver@nvidia.com> X-Mailer: git-send-email 1.9.1 X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.21.24.170] X-ClientProxiedBy: DRUKMAIL101.nvidia.com (10.25.59.19) To UKMAIL101.nvidia.com (10.26.138.13) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1795 Lines: 65 For validation purposes, it's often useful to be able to retrieve the list of possible parents in userspace. Add a debugfs file for every clock which has more than 1 possible parent. Signed-off-by: Peter De Schrijver Reviewed-by: Jon Mayo --- drivers/clk/clk.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index f5f2bcd..2fa2fb8 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2128,6 +2128,34 @@ static int clk_dump_open(struct inode *inode, struct file *file) .release = single_release, }; +static int possible_parents_dump(struct seq_file *s, void *data) +{ + struct clk_core *core; + int i; + + core = (struct clk_core *)s->private; + + for (i = 0; i < core->num_parents - 1; i++) + seq_printf(s, "%s ", core->parent_names[i]); + + seq_printf(s, "%s\n", core->parent_names[i]); + + return 0; +} + +static int possible_parents_open(struct inode *inode, struct file *file) +{ + return single_open(file, possible_parents_dump, inode->i_private); +} + + +static const struct file_operations possible_parents_fops = { + .open = possible_parents_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry) { struct dentry *d; @@ -2179,6 +2207,13 @@ static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry) if (!d) goto err_out; + if (core->num_parents > 1) { + d = debugfs_create_file("clk_possible_parents", S_IRUGO, + core->dentry, core, &possible_parents_fops); + if (!d) + goto err_out; + } + if (core->ops->debug_init) { ret = core->ops->debug_init(core->hw, core->dentry); if (ret) -- 1.9.1